Data storage based on data polarity

ABSTRACT

Methods, systems, and devices for storing and reading data at a memory device are described. A memory device may utilize one or more storage states to store data within a data word. The memory device may exhibit higher data leakage or more power consumption when storing or reading a first storage state compared to storing or reading one or more other storage states. In some cases, the memory device may generate a second data word corresponding to a first data word by modifying each symbol type of the first data word to generate a different symbol type for the second data word. A memory device may reduce the occurrence of a storage state associated with large data leakage, or high-power consumption, or both. Further, the memory device may generate and store an indicator indicating the transformation of a corresponding data word.

CROSS REFERENCE

The present application for Patent a continuation of U.S. patentapplication Ser. No. 16/459,462 by Pawlowski, entitled “DATA STORAGEBASED ON DATA POLARITY” filed Jul. 1, 2019, which claims priority toU.S. Provisional Patent Application No. 62/693,786 by Schreck et al.,entitled “DATA STORAGE BASED ON DATA POLARITY” filed Jul. 3, 2018,assigned to the assignee hereof and each of which is expresslyincorporated by reference in its entirety.

BACKGROUND

The following relates generally to a system that includes a memorydevice and, more specifically to data storage based on data polarity.

Memory devices are widely used to store information in variouselectronic devices such as computers, wireless communication devices,cameras, digital displays, and the like. Information is stored byprograming different states of a memory device. For example, binarydevices most often store one of two states, often denoted by a logic 1or a logic 0. In other devices (e.g., a multi-level cell (MLC) device),more than two states may be stored. To access the stored information, acomponent of the device may read, or sense, at least one stored state inthe memory device. To store information, a component of the device maywrite, or program, the state in the memory device.

Various types of memory devices exist, including magnetic hard disks,random access memory (RAM), read only memory (ROM), dynamic RAM (DRAM),synchronous dynamic RAM (SDRAM), ferroelectric RAM (FeRAM), magnetic RAM(MRAM), resistive RAM (RRAM), flash memory, phase change memory (PCM),and others. Memory devices may be volatile or non-volatile. Volatilememory devices, e.g., DRAM, may lose their stored state over time unlessthey are periodically refreshed by an external power source. Improvingmemory devices, generally, may include increasing memory cell density,increasing read/write speeds, increasing reliability, increasing dataretention, reducing power consumption, or reducing manufacturing costs,among other metrics. Some memory devices may utilize data bus inversion(DBI) to decrease power consumption while communicating data. But DBImay not address increased performance for (e.g., data retention, powerconsumption) related to data storage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system that supports data storagebased on data polarity in accordance with the present disclosure.

FIG. 2 illustrates an example of a memory array that supports datastorage based on data polarity in accordance with the presentdisclosure.

FIG. 3 illustrates an example of a process flow that supports datastorage based on data polarity in accordance with the presentdisclosure.

FIG. 4 illustrates examples of data transformations that support datastorage based on data polarity in accordance with the presentdisclosure.

FIG. 5 illustrates an example of a process flow that supports datastorage based on data polarity in accordance with the presentdisclosure.

FIG. 6 a block diagram of a device that supports data storage based ondata polarity in accordance with the present disclosure.

FIG. 7 shows a block diagram of a device that supports data storagebased on data polarity in accordance with the present disclosure.

FIGS. 8 through 11 show flowcharts illustrating a method or methods thatsupport data storage based on data polarity in accordance with thepresent disclosure.

DETAILED DESCRIPTION

In some memory devices (e.g., DRAM memory devices), a memory cell mayexperience current or charge leakage, which may affect the reliabilityof data stored in the memory cell and, in turn, the array of which thecell is a component. This may manifest as a decrease in data retentionand data integrity such that the memory device may exhibit higher errorrates as a result of stored charges leaking off over time. Throughoutthe disclosure, the term leakage may refer to charge or current leakage,or to the resulting impact on the information or data stored in a cell(e.g., “data leakage”). In some cases, certain storage states (e.g.,charge levels) may exhibit higher rates of leakage than other storagestates. In other examples, a memory device may utilize higher powerconsumption when storing one storage state when compared to storing oneor more other storage states. That is, the memory device may exhibitpoorer performance when storing or reading a first storage state whencompared to storing or reading a second storage state. In some cases,reducing the occurrence of the storage stage with large data leakage orpower consumption may increase the overall performance of the memorydevice (e.g., improved data retention, lower power consumption).

In accordance with the disclosure herein, a memory device may transformdata before storing the data in one or more memory cells to reduceleakage and thereby improve data retention and/or data integrity. Thememory device may receive a first data word to be stored in the memorydevice. The memory device may determine whether the first data wordmeets a storage state criterion. For example, the memory device maydetermine symbol types that may be stored in the memory cells as part ofthe data word. The memory device may generate a second data wordcorresponding to the first data word by applying a transformation to thefirst data word. The transformation may include modifying each symboltype of the first data word to a corresponding symbol type for thesecond data word. With the transformation, the memory device may reducethe amount of data leakage for storing the first data word and therebyreduce data loss, errors, or other detrimental behavior.

Further, the memory device may generate and store an indicatorcorresponding to the second data word stored in the memory device. Theindicator may indicate that the second data word is a transformedversion of the first data word. In this manner, the memory device mayreduce the occurrence of symbol types associated with detrimentalbehavior which may, in turn, increase the performance of the memorydevice (e.g., increase data retention, power consumption). In somecases, the memory device may include one or more multi-level memorycells that are configured to store three or more states. Thesetransformations can be used to transform multi-level data and reducedata leakage in multi-level memory devices.

Features of the disclosure are initially described in the context of amemory system. Features of the disclosure are described in the contextof process flows, an example of a multi-level cell transformation, anddevice block diagrams. These and other features of the disclosure arefurther illustrated by and described with reference to apparatusdiagrams, system diagrams, and flowcharts that relate to data storagebased on data polarity.

FIG. 1 illustrates an example of a system 100 that utilizes one or morememory devices in accordance with aspects disclosed herein. The system100 may include an external memory controller 105, a memory device 110,and a plurality of channels 115 coupling the external memory controller105 with the memory device 110. The system 100 may include one or morememory devices, but for ease of description the one or more memorydevices may be described as a single memory device 110.

The system 100 may include aspects of an electronic device, such as acomputing device, a mobile computing device, a wireless device, or agraphics processing device. The system 100 may be an example of aportable electronic device. The system 100 may be an example of acomputer, a laptop computer, a tablet computer, a smartphone, a cellularphone, a wearable device, an internet-connected device, or the like. Thememory device 110 may be component of the system configured to storedata for one or more other components of the system 100. In someexamples, the system 100 is configured for bi-directional wirelesscommunication with other systems or devices using a base station oraccess point. In some examples, the system 100 is capable ofmachine-type communication (MTC), machine-to-machine (M2M)communication, or device-to-device (D2D) communication.

At least portions of the system 100 may be examples of a host device.Such a host device may be an example of a device that uses memory toexecute processes such as a computing device, a mobile computing device,a wireless device, a graphics processing device, a computer, a laptopcomputer, a tablet computer, a smartphone, a cellular phone, a wearabledevice, an internet-connected device, some other stationary or portableelectronic device, or the like. In some cases, the host device may referto the hardware, firmware, or software, or a combination thereof thatimplements the functions of the external memory controller 105. In somecases, the external memory controller 105 may be referred to as a hostor host device.

In some cases, a memory device 110 may be an independent device orcomponent that is configured to be in communication with othercomponents of the system 100 and provide physical memory addresses/spaceto potentially be used or referenced by the system 100. In someexamples, a memory device 110 may be configurable to work with at leastone or a plurality of different types of systems 100. Signaling betweenthe components of the system 100 and the memory device 110 may beoperable to support modulation schemes to modulate the signals,different pin designs for communicating the signals, distinct packagingof the system 100 and the memory device 110, clock signaling andsynchronization between the system 100 and the memory device 110, timingconventions, and/or other factors.

The memory device 110 may be configured to store data for the componentsof the system 100. In some cases, the memory device 110 may act as aslave-type device to the system 100 (e.g., responding to and executingcommands provided by the system 100 through the external memorycontroller 105). Such commands may include an access command for anaccess operation, such as a write command for a write operation, a readcommand for a read operation, a refresh command for a refresh operation,or other commands. The memory device 110 may include one or more memorydice 160 (e.g., memory chips) to support a desired or specified capacityfor data storage. The memory device 110 including two or more memorydice 160 may be referred to as a multi-die memory or package (alsoreferred to as multi-chip memory or package).

The system 100 may further include a processor 120, a basic input/outputsystem (BIOS) component 125, one or more peripheral components 130, andan input/output (I/O) controller 135. The components of system 100 maybe in electronic communication with one another using a bus 140.

The processor 120 may be configured to control at least portions of thesystem 100. The processor 120 may be a general-purpose processor, adigital signal processor (DSP), an application-specific integratedcircuit (ASIC), a field-programmable gate array (FPGA) or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or it may be a combination of these types ofcomponents. In such cases, the processor 120 may be an example of acentral processing unit (CPU), a graphics processing unit (GPU), or asystem on a chip (SoC), among other examples.

The BIOS component 125 may be a software component that includes a BIOSoperated as firmware, which may initialize and run various hardwarecomponents of the system 100. The BIOS component 125 may also managedata flow between the processor 120 and the various components of thesystem 100, e.g., the peripheral components 130, the I/O controller 135,etc. The BIOS component 125 may include a program or software stored inread-only memory (ROM), flash memory, or any other non-volatile memory.

The peripheral component(s) 125 may be any input device or outputdevice, or an interface for such devices, that may be integrated into orwith the system 100. Examples may include disk controllers, soundcontroller, graphics controller, Ethernet controller, modem, universalserial bus (USB) controller, a serial or parallel port, or peripheralcard slots, such as peripheral component interconnect (PCI) oraccelerated graphics port (AGP) slots. The peripheral component(s) 125may be other components understood by those skilled in the art asperipherals.

The I/O controller 135 may manage data communication between theprocessor 120 and the peripheral component(s) 13, input devices 145, oroutput devices 150. The I/O controller 135 may manage peripherals thatare not integrated into or with the system 100. In some cases, the I/Ocontroller 135 may represent a physical connection or port to externalperipheral components.

The input 145 may represent a device or signal external to the system100 that provides information, signals, or data to the system 100 or itscomponents. This may include a user interface or interface with orbetween other devices. In some cases, the input 145 may be a peripheralthat interfaces with system 100 via one or more peripheral components130 or may be managed by the I/O controller 135.

The output 150 may represent a device or signal external to the system100 configured to receive an output from the system 100 or any of itscomponents. Examples of the output 150 may include a display, audiospeakers, a printing device, or another processor on printed circuitboard, etc. In some cases, the output 150 may be a peripheral thatinterfaces with the system 100 via one or more peripheral components 130or may be managed by the I/O controller 135.

The components of system 100 may be made up of general-purpose orspecial purpose circuitry designed to carry out their functions. Thismay include various circuit elements, for example, conductive lines,transistors, capacitors, inductors, resistors, amplifiers, or otheractive or passive elements, configured to carry out the functionsdescribed herein.

The memory device 110 may include a device memory controller 155 and oneor more memory dice 160. Each memory die 160 may include a local memorycontroller 165 (e.g., local memory controller 165-a, local memorycontroller 165-b, and/or local memory controller 165-N) and a memoryarray 170 (e.g., memory array 170-a, memory array 170-b, and/or memoryarray 170-N). A memory array 170 may be a collection (e.g., a grid) ofmemory cells, with each memory cell being configured to store at leastone bit of digital data. In some cases, each memory cell may beconfigured to store more than one bit of digital data (i.e., each memorycell may have three or more types of storage states rather than two). Insome cases, certain storage states may exhibit higher rates of leakagethan other storage states. Additionally or alternatively, the memorydevice 110 may utilize more power when storing one type of storage statecompared to other types of storage states. In some cases, the memorydevice 110 may reduce the occurrence of the storage state with largedata leakage and/or the storage state associated with high powerconsumption. Features of memory arrays 170 and/or memory cells aredescribed in more detail with reference to FIG. 2.

The memory device 110 may be an example of a two-dimensional (2D) arrayof memory cells or may be an example of a three-dimensional (3D) arrayof memory cells. For example, a 2D memory device may include a singlememory die 160. A 3D memory device may include two or more memory dice160 (e.g., memory die 160-a, memory die 160-b, and/or any number ofmemory dice 160-N). In a 3D memory device, a plurality of memory dice160-N may be stacked on top of one another. In some cases, memory dice160-N in a 3D memory device may be referred to as decks, levels, layers,or dies. A 3D memory device may include any quantity of stacked memorydice 160-N (e.g., two high, three high, four high, five high, six high,seven high, eight high). This may increase the number of memory cellsthat may be positioned on a substrate as compared with a single 2Dmemory device, which in turn may reduce production costs or increase theperformance of the memory array, or both.

The device memory controller 155 may include circuits or componentsconfigured to control operation of the memory device 110. As such, thedevice memory controller 155 may include the hardware, firmware, andsoftware that enables the memory device 110 to perform commands and maybe configured to receive, transmit, or execute commands, data, orcontrol information related to the memory device 110. The device memorycontroller 155 may be configured to communicate with the external memorycontroller 105, the one or more memory dice 160, or the processor 120.In some cases, the memory device 110 may receive data and/or commandsfrom the external memory controller 105. For example, the memory device110 may receive a write command indicating that the memory device 110 isto store certain data on behalf of a component of the system 100 (e.g.,the processor 120) or a read command indicating that the memory device110 is to provide certain data stored in a memory die 160 to a componentof the system 100 (e.g., the processor 120).

In some cases, the device memory controller 155 may control operation ofthe memory device 110 described herein in conjunction with the localmemory controller 165 of the memory die 160. Examples of the componentsincluded in the device memory controller 155 and/or the local memorycontrollers 165 may include receivers for demodulating signals receivedfrom the external memory controller 105, decoders for modulating andtransmitting signals to the external memory controller 105, logic,decoders, amplifiers, filters, or the like.

The local memory controller 165 (e.g., local to a memory die 160) may beconfigured to control operations of the memory die 160. Also, the localmemory controller 165 may be configured to communicate (e.g., receiveand transmit data and/or commands) with the device memory controller155. The local memory controller 165 may support the device memorycontroller 155 to control operation of the memory device 110 describedherein. In some cases, the memory device 110 does not include the devicememory controller 155, and the local memory controller 165 or theexternal memory controller 105 may perform the various functionsdescribed herein. As such, the local memory controller 165 may beconfigured to communicate with the device memory controller 155, withother local memory controllers 165, or directly with the external memorycontroller 105 or the processor 120.

The external memory controller 105 may be configured to enablecommunication of information, data, and/or commands between componentsof the system 100 (e.g., the processor 120) and the memory device 110.The external memory controller 105 may act as a liaison between thecomponents of the system 100 and the memory device 110 so that thecomponents of the system 100 may not need to know the details of thememory device's operation. The components of the system 100 may presentrequests to the external memory controller 105 (e.g., read commands orwrite commands) that the external memory controller 105 satisfies. Theexternal memory controller 105 may convert or translate communicationsexchanged between the components of the system 100 and the memory device110. In some cases, the external memory controller 105 may include asystem clock that generates a common (source) system clock signal. Insome cases, the external memory controller 105 may include a common dataclock that generates a common (source) data clock signal.

In some cases, the external memory controller 105 or other component ofthe system 100, or its functions described herein, may be implemented bythe processor 120. For example, the external memory controller 105 maybe hardware, firmware, or software, or some combination thereofimplemented by the processor 120 or other component of the system 100.While the external memory controller 105 is depicted as being externalto the memory device 110, in some cases, the external memory controller105, or its functions described herein, may be implemented by a memorydevice 110 or at a module (e.g., a dual inline memory module (DIMM))that includes memory device 110. For example, the external memorycontroller 105 may be hardware, firmware, or software, or somecombination thereof implemented by the device memory controller 155 orone or more local memory controllers 165. In some cases, the externalmemory controller 105 may be distributed across the processor 120 andthe memory device 110 such that portions of the external memorycontroller 105 are implemented by the processor 120 and other portionsare implemented by a device memory controller 155 or a local memorycontroller 165. Likewise, in some cases, one or more functions ascribedherein to the device memory controller 155 or local memory controller165 may in some cases be performed by the external memory controller 105(either separate from or as included in the processor 120).

The components of the system 100 may exchange information with thememory device 110 using a plurality of channels 115. In some examples,the channels 115 may enable communications between the external memorycontroller 105 and the memory device 110. Each channel 115 may includeone or more signal paths or transmission mediums (e.g., conductors)between terminals associated with the components of system 100. Forexample, a channel 115 may include a first terminal including one ormore pins or pads at external memory controller 105 and one or more pinsor pads at the memory device 110. A pin may be an example of aconductive input or output point of a device of the system 100, and apin may be configured to act as part of a channel. In some cases, a pinor pad of a terminal may be part of to a signal path of the channel 115.Additional signal paths may be coupled with a terminal of a channel forrouting signals within a component of the system 100. For example, thememory device 110 may include signal paths (e.g., signal paths internalto the memory device 110 or its components, such as internal to a memorydie 160) that route a signal from a terminal of a channel 115 to thevarious components of the memory device 110 (e.g., a device memorycontroller 155, memory dice 160, local memory controllers 165, memoryarrays 170).

Channels 115 (and associated signal paths and terminals) may bededicated to communicating specific types of information. In some cases,a channel 115 may be an aggregated channel and thus may include multipleindividual channels. For example, a data channel 190 may be x4 (e.g.,including four signal paths), x8 (e.g., including eight signal paths),x16 (including sixteen signal paths), etc.

In some cases, the channels 115 may include one or more command andaddress (CA) channels 186. The CA channels 186 may be configured tocommunicate commands between the external memory controller 105 and thememory device 110 including control information associated with thecommands (e.g., address information). For example, the CA channel 186may include a read command with an address of the desired data. In somecases, the CA channels 186 may be registered on a rising clock signaledge and/or a falling clock signal edge. In some cases, a CA channel 186may include eight or nine signal paths.

In some cases, the channels 115 may include one or more clock signal(CK) channels 188. The CK channels 188 may be configured to communicateone or more common clock signals between the external memory controller105 and the memory device 110. Each clock signal may be configuredoscillate between a high state and a low state and coordinate theactions of the external memory controller 105 and the memory device 110.In some cases, the clock signal may be a differential output (e.g., a CKt signal and a CK c signal) and the signal paths of the CK channels 188may be configured accordingly. In some cases, the clock signal may besingle ended. In some cases, the clock signal may be a 1.5 GHz signal. ACK channel 188 may include any number of signal paths. In some cases,the clock signal CK (e.g., a CK t signal and a CK c signal) may providea timing reference for command and addressing operations for the memorydevice 110, or other system-wide operations for the memory device 110.The clock signal CK therefore may be variously referred to as a controlclock signal CK, a command clock signal CK, or a system clock signal CK.The system clock signal CK may be generated by a system clock, which mayinclude one or more hardware components (e.g., oscillators, crystals,logic gates, transistors, or the like).

In some cases, the channels 115 may include one or more data (DQ)channels 190. The data channels 190 may be configured to communicatedata and/or control information between the external memory controller105 and the memory device 110. For example, the data channels 190 maycommunicate information (e.g., bi-directional) to be written to thememory device 110 or information read from the memory device 110. Thedata channels 190 may communicate signals that may be modulated using avariety of different modulation schemes (e.g., NRZ, PAM4).

In some cases, the channels 115 may include one or more other channels192 that may be dedicated to other purposes. These other channels 192may include any number of signal paths.

In some cases, the other channels 192 may include one or more writeclock signal (WCK) channels. While the ‘W’ in WCK may nominally standfor “write,” a write clock signal WCK (e.g., a WCK_t signal and a WCK_csignal) may provide a timing reference for access operations generallyfor the memory device 110 (e.g., a timing reference for both read andwrite operations). Accordingly, the write clock signal WCK may also bereferred to as a data clock signal WCK. The WCK channels may beconfigured to communicate a common data clock signal between theexternal memory controller 105 and the memory device 110. The data clocksignal may be configured coordinate an access operation (e.g., a writeoperation or read operation) of the external memory controller 105 andthe memory device 110. In some cases, the write clock signal may be adifferential output (e.g., a WCK_t signal and a WCK_c signal) and thesignal paths of the WCK channels may be configured accordingly. A WCKchannel may include any number of signal paths. The data clock signalWCK may be generated by a data clock, which may include one or morehardware components (e.g., oscillators, crystals, logic gates,transistors, or the like).

In some cases, the other channels 192 may include one or more errordetection code (EDC) channels. The EDC channels may be configured tocommunicate error detection signals, such as checksums, to improvesystem reliability. An EDC channel may include any number of signalpaths. In some examples, error correction codes (ECCs) may further beutilized to improve system reliability.

The channels 115 may couple the external memory controller 105 with thememory device 110 using a variety of different architectures. Examplesof the various architectures may include a bus, a point-to-pointconnection, a crossbar, a high-density interposer such as a siliconinterposer, or channels formed in an organic substrate or somecombination thereof. For example, in some cases, the signal paths may atleast partially include a high-density interposer, such as a siliconinterposer or a glass interposer.

Signals communicated over the channels 115 may be modulated using avariety of different modulation schemes. In some cases, a binary-symbol(or binary-level) modulation scheme may be used to modulate signalscommunicated between the external memory controller 105 and the memorydevice 110. A binary-symbol modulation scheme may be an example of aM-ary modulation scheme where M is equal to two. Each symbol of abinary-symbol modulation scheme may be configured to represent one bitof digital data (e.g., a symbol may represent a logic 1 or a logic 0).Examples of binary-symbol modulation schemes include, but are notlimited to, non-return-to-zero (NRZ), unipolar encoding, bipolarencoding, Manchester encoding, pulse amplitude modulation (PAM) havingtwo symbols (e.g., PAM2), and/or others.

In some cases, a multi-symbol (or multi-level) modulation scheme may beused to modulate signals communicated between the external memorycontroller 105 and the memory device 110. A multi-symbol modulationscheme may be an example of a M-ary modulation scheme where M is greaterthan or equal to three. Each symbol of a multi-symbol modulation schememay be configured to represent more than one bit of digital data (e.g.,a symbol may represent a logic 00, a logic 01, a logic 10, or a logic11). Examples of multi-symbol modulation schemes include, but are notlimited to, PAM4, PAM8, etc., quadrature amplitude modulation (QAM),quadrature phase shift keying (QPSK), and/or others. A multi-symbolsignal or a PAM4 signal may be a signal that is modulated using amodulation scheme that includes at least three levels to encode morethan one bit of information. Multi-symbol modulation schemes and symbolsmay alternatively be referred to as non-binary, multi-bit, orhigher-order modulation schemes and symbols.

FIG. 2 illustrates an example of a memory die 200 in accordance withvarious examples of the present disclosure. The memory die 200 may be anexample of the memory dice 160 described with reference to FIG. 1. Insome cases, the memory die 200 may be referred to as an electronicmemory apparatus. The memory die 200 may include one or more memorycells 205 that are programmable to store different logic states. Eachmemory cell 205 may be programmable to store two or more states. Forexample, the memory cell 205 may be configured to store one bit ofdigital logic at a time (e.g., a logic 0 and a logic 1). In some cases,a single memory cell 205 (e.g., a multi-level memory cell) may beconfigured to store more than one bit of digit logic at a time (e.g., alogic 00, logic 01, logic 10, or a logic 11).

A memory cell 205 may store a charge representative of the programmablestates in a capacitor. DRAM architectures may include a capacitor thatincludes a dielectric material to store a charge representative of theprogrammable state. In some cases, the dielectric material may havevarious characteristics that enable it to store certain charges withless leakage than other charges.

Operations such as reading and writing may be performed on memory cells205 by activating or selecting access lines such as a word line 210and/or a digit line 215. In some cases, digit lines 215 may also bereferred to as bit lines. References to access lines, word lines anddigit lines, or their analogues, are interchangeable without loss ofunderstanding or operation. Activating or selecting a word line 210 or adigit line 215 may include applying a voltage to the respective line.

The memory die 200 may arrange the access lines (e.g., the word lines210 and the digit lines 215) in a grid-like pattern. Memory cells 205may be positioned at intersections of the word lines 210 and the digitlines 215. By biasing a word line 210 and a digit line 215 (e.g.,applying a voltage to the word line 210 or the digit line 215), a singlememory cell 205 may be accessed at their intersection.

Accessing the memory cells 205 may be controlled through a row decoder220, a column decoder 225. For example, a row decoder 220 may receive arow address from the local memory controller 260 and activate a wordline 210 based on the received row address. A column decoder 225 mayreceive a column address from the local memory controller 260 and mayactivate a digit line 215 based on the received column address. Forexample, memory die 200 may include multiple word lines 210, labeledWL_1 through WL M, and multiple digit lines 215, labeled DL_1 through DLN, where M and N depend on the size of the memory die 200. Thus, byactivating a word line 210 and a digit line 215, e.g., WL_1 and DL 3,the memory cell 205 at their intersection may be accessed. Theintersection of a word line 210 and a digit line 215, in either atwo-dimensional or three-dimensional configuration, may be referred toas an address of a memory cell 205.

The memory cell 205 may include a logic storage component, such ascapacitor 230 and a switching component 235. The capacitor 230 may be anexample of a dielectric capacitor or a ferroelectric capacitor. A firstnode of the capacitor 230 may be coupled with the switching component235 and a second node of the capacitor 230 may be coupled with a voltagesource 240. In some cases, the voltage source 240 is a ground such asVss. In some cases, the voltage source 240 may be an example of a plateline coupled with a plate line driver. The switching component 235 maybe an example of a transistor or any other type of switch device thatselectively establishes or de-establishes electronic communicationbetween two components.

Selecting or deselecting the memory cell 205 may be accomplished byactivating or deactivating the switching component 235. The capacitor230 may be in electronic communication with the digit line 215 using theswitching component 235. For example, the capacitor 230 may be isolatedfrom digit line 215 when the switching component 235 is deactivated, andthe capacitor 230 may be coupled with digit line 215 when the switchingcomponent 235 is activated. In some cases, the switching component 235is a transistor that is controlled by applying a voltage to a gate ofthe transistor. When the voltage differential between the transistorgate and transistor source is greater than the voltage threshold of thetransistor, the switching component 235 may be activated or deactivatebased on being a p-type transistor or an n-type transistor. The wordline 210 may be in electronic communication with the gate of theswitching component 235 and may activate/deactivate the switchingcomponent 235 based on a voltage being applied to word line 210

A word line 210 may be a conductive line in electronic communicationwith a memory cell 205 that is used to perform access operations on thememory cell 205. In some architectures, the word line 210 may be inelectronic communication with a gate of a switching component 235 of amemory cell 205 and may be configured to control the switching component235 of the memory cell. In some architectures, the word line 210 may bein electronic communication with a node of the capacitor of the memorycell 205 and the memory cell 205 may not include a switching component.

A digit line 215 may be a conductive line that connects the memory cell205 with a sense component 245. In some architectures, the memory cell205 may be selectively coupled with the digit line 215 during portionsof an access operation. For example, the word line 210 and the switchingcomponent 235 of the memory cell 205 may be configured to couple and/orisolate the capacitor 230 of the memory cell 205 and the digit line 215.In some architectures, the memory cell 205 may be in electroniccommunication (e.g., constant) with the digit line 215.

The sense component 245 may be configured to detect state (e.g., acharge) stored on the capacitor 230 of the memory cell 205 and determinea logic state of the memory cell 205 based on the stored state. A chargestored by a memory cell 205 may be extremely small, in some cases. Assuch, the sense component 245 may include one or more sense amplifiersto amplify the signal output by the memory cell 205 during a readoperation. The sense amplifiers may detect small changes in the chargeof a digit line 215 during a read operation and may amplify a signal toa logic state 0 or a logic state 1 based on the detected charge.Alternatively, the memory cell 205 may be a multi-level cell (MLC)capable of storing more than binary information (i.e., memory cell 205may store three or more types of symbols rather than two). During a readoperation, the capacitor 230 of memory cell 205 may output a signal(e.g., discharge a charge to its corresponding digit line 215. Thesignal may cause a voltage of the digit line 215 to change. The sensecomponent 245 may be configured to compare the signal received from thememory cell 205 across the digit line 215 to a reference signal 250(e.g., reference voltage). The sense component 245 may determine thestored state of the memory cell 205 based on the comparison. Forexample, in binary-signaling, if digit line 215 has a higher voltagethan the reference signal 250, the sense component 245 may determinethat the stored state of memory cell 205 is a logic 1 and, if the digitline 215 has a lower voltage than the reference signal 250, the sensecomponent 245 may determine that the stored state of the memory cell 205is a logic 0. The sense component 245 may include various transistors oramplifiers to detect and amplify a difference in the signals. Thedetected logic state of memory cell 205 may be output through columndecoder 225 as output 255. In some cases, the sense component 245 may bepart of another component (e.g., a column decoder 225, row decoder 220).In some cases, the sense component 245 may be in electroniccommunication with the row decoder 220 or the column decoder 225.

The local memory controller 260 may control the operation of memorycells 205 through the various components (e.g., row decoder 220, columndecoder 225, and sense component 245). The local memory controller 260may be an example of the local memory controller 165 described withreference to FIG. 1. In some cases, one or more of the row decoder 220,column decoder 225, and sense component 245 may be co-located with thelocal memory controller 260. The local memory controller 260 may beconfigured to receive commands and/or data from a controller 105,translate the commands and/or data into information that can be used bythe memory die 200, perform one or more operations on the memory die200, and communicate data from the memory die 200 to the controller 105in response to performing the one or more commands. The local memorycontroller 260 may generate row and column address signals to activatethe target word line 210 and the target digit line 215. The local memorycontroller 260 may also generate and control various voltages orcurrents used during the operation of memory die 200. In general, theamplitude, shape, or duration of an applied voltage or current discussedherein may be adjusted or varied and may be different for the variousoperations discussed in operating the memory die 200.

In some cases, the local memory controller 260 may be configured toperform a write operation (e.g., a programming operation) on one or morememory cells 205 of the memory die 200. During a write operation, amemory cell 205 of the memory die 200 may be programmed to store a logicstate. In some cases, certain logic states may exhibit higher rates ofleakage than other logic states. In other examples, certain logic statesmay utilize higher power consumption when being stored than others logicstates. In some cases, the local memory controller 260 may be configuredto reduce the occurrence of logic states with large data leakage orhigh-power consumption which may increase the overall performance ofmemory die 200. The local memory controller 260 may further beconfigured to generate and store an indicator that indicates whether thestored logic states may be transformed versions of different logicstates.

In some cases, a plurality of memory cells 205 may be programmed duringa single write operation. The local memory controller 260 may identify atarget memory cell 205 on which to perform the write operation. Thelocal memory controller 260 may identify a target word line 210 and atarget digit line 215 in electronic communication with the target memorycell 205 (e.g., the address of the target memory cell 205). The localmemory controller 260 may activate the target word line 210 and thetarget digit line 215 (e.g., applying a voltage to the word line 210 ordigit line 215), to access the target memory cell 205. The local memorycontroller 260 may apply a specific signal (e.g., voltage) to the digitline 215 during the write operation to store a specific state in thecapacitor 230 of the memory cell 205, the specific state may beindicative of a desired logic state.

In some cases, the local memory controller 260 may be configured toperform a read operation (e.g., a sense operation) on one or more memorycells 205 of the memory die 200. During a read operation, the logicstate stored on a memory cell 205 of the memory die 200 may bedetermined. In some cases, a plurality of memory cells 205 may be sensedduring a single read operation. The local memory controller 260 mayidentify a target memory cell 205 on which to perform the readoperation. The local memory controller 260 may identify a target wordline 210 and a target digit line 215 in electronic communication withthe target memory cell 205 (e.g., the address of the target memory cell205). The local memory controller 260 may activate the target word line210 and the target digit line 215 (e.g., applying a voltage to the wordline 210 or digit line 215), to access the target memory cell 205. Thetarget memory cell 205 may transfer a signal to the sense component 245in response to biasing the access lines. The sense component 245 mayamplify the signal. The local memory controller 260 may fire the sensecomponent 245 (e.g., latch the sense component) and thereby compare thesignal received from the memory cell 205 to the reference signal 250.Based on that comparison, the sense component 245 may determine a logicstate that is stored on the memory cell 205.

In some cases, sense component 245 may further determine a logic stateof an indicator associated with the logic state that may be stored onthe memory cell 205, where the indicator indicates whether the storedlogic state may be a transformed version of a different logic state. Ifthe stored logic state may be a transformed version of a different logicstate, the local memory controller 260 may communicate the stored logicstate to the controller 105 using the input/output 255 as part of theread operation. In this example, the local memory controller 260 maycommunicate that the logic state stored on the memory cell 205 may be atransformed version of a different logic state. Alternatively, the localmemory controller 260 may transform the stored logic state into thedifferent logic state and communicate the different logic state to thecontroller 105 using the input/output 255 as part of the read operation.

In some memory architectures, accessing the memory cell 205 may degradeor destroy the logic state stored in a memory cell 205. For example, aread operation performed in DRAM architectures may partially orcompletely discharge the capacitor of the target memory cell. The localmemory controller 260 may perform a re-write operation or a refreshoperation to return the memory cell to its original logic state. Thelocal memory controller 260 may re-write the logic state to the targetmemory cell after a read operation. In some cases, the re-writeoperation may be considered part of the read operation. Additionally,activating a single access line, such as a word line 210, may disturbthe state stored in some memory cells in electronic communication withthat access line. Thus, a re-write operation or refresh operation may beperformed on one or more memory cells that may not have been accessed.

FIG. 3 illustrates an example of a process flow 300 that supports datastorage based on data polarity in accordance with disclosed herein. Insome examples, process flow 300 may implement aspects of the system 100and the memory die 200. For example, the host device 305 may be anexample of the host device described with reference to FIG. 1 and thememory device 310 may be an example of memory device 110. The processflow 300 illustrates a write operation and a read operation, where thewrite and read operations may include transforming data based on datapolarity at the memory device 310.

The host device 305 may initiate a write operation at the memory device310. The write operation may include the host device 305 transmittingwrite command 315 to the memory device 310. Write command 315 maycomprise a first data word that is to be stored in the memory device310. The host device 305 may identify information to be stored in thememory device 310 and may generate the first data word based on thatidentified information.

At 320, the memory device 310 may determine whether the first data wordsatisfies a storage state criterion. In some instances, the storagestate criterion may indicate a characteristic of the memory cellsassociated with the memory device 310. In turn, the characteristic mayindicate a symbol type that is associated with poorer performance suchas higher data leakage or increase power consumption compared to one ormore other symbol types. That is, the storage state criterion may beassociated with the memory device 310 and may be a criterion related toa symbol type that is associated with poorer performance.

The storage state criterion determined at 320 may indicate a first dataretention characteristic indicating a symbol type the memory device 310that exhibits more leakage when stored in the memory device 310 comparedto one or more other symbol types. In another example, the storage statecriterion may indicate a first power consumption characteristicindicating a symbol type that is configured to be stored in the memorydevice 310 that exhibits more power consumption compared to one or moresymbol types configured to be stored in the memory device that are notindicated by the first power consumption characteristic.

Additionally or alternatively, the memory device 310 may also determinea second storage state criterion at 320. The second storage statecriterion may indicate a symbol type or types that are associated withincreased overall performance compared to the symbol type correspondingto the first storage state criterion. In some cases, the memory device310 may determine a quantity of symbols of the first data word that area symbol type associated with the second data retention characteristicof the one or more memory cells of the memory device. If the memorydevice 310 may determine that the quantity of symbols of the first dataword that are the symbol type associated with the second data retentioncharacteristic satisfies the second data retention characteristicthreshold, the memory device 310 may store the first data word at 325.For example, the memory device 310 may determine that the quantity ofsymbols of the first data word that are associated with the second dataretention characteristic may exceed a threshold number and/or satisfy astorage state threshold for the memory device 310. Therefore, if thememory device 310 determines that the first data word satisfies thesecond storage state criterion, the memory device 310 may store the dataword included in write command 315 without performing a transformation.

The memory device 310, however, may determine that the quantity ofsymbols of the first data word that are the symbol type associated withthe second data retention characteristic fails to satisfy the seconddata retention characteristic threshold of the memory device. Forexample, the quantity of symbols of the first data word that areassociated with the second data retention characteristic may be under athreshold number. That is, the first data word may fail to satisfy astorage state threshold of the memory device. In such instances, thememory device 310 may determine that the first data word satisfies thefirst storage state criterion as it relates to the symbol types thatexhibit detrimental behavior. In this example, the memory device 310 maygenerate a second data word and a corresponding indicator at 330. Thesecond data word may satisfy the second storage state criterion, wherethe second data word may be generated by applying a transformation tothe first data word based on determining that the first data wordsatisfies a first storage state criterion. In some cases, the memorydevice 310 may determine that the quantity of symbols of the second dataword that are the symbol type associated with the second data retentioncharacteristic satisfies the storage state threshold of the memorydevice 310. The memory device 310 may then determine that the seconddata word satisfies the second storage state criterion based ondetermining that the quantity of symbols of the second data word thatare the symbol type associated with the second data retentioncharacteristic satisfies the storage state threshold of the memorydevice 310.

At 330, the memory device 310 may optionally modify one or more symbolsof the first data word to generate the second data word (in some caseseach symbol of the first data word may be modified). The memory device310 may determine a quantity of symbols of the second data word that area symbol type associated with the second data retention characteristicand determine that the second data word satisfies the second storagestate criterion based no determining the quantity of symbols of thesecond data word that are a symbol type associated with the second dataretention characteristic. In some cases, the first data word may includetwo symbol types and the transformation may be an example of a data bitinversion. That is, each ‘0’ or low value of the first data word may betransformed into a ‘1’ or high value in the second data word. Similarly,each ‘1’ or high value of the first data word may be transformed into a‘0’ or low′ value in the second data word. In other examples, the firstdata word and the second data word may include three or more symboltypes. In these examples, each symbol type of the first data word may bemapped to a different symbol type for the second data word.

In some examples, the memory device 310 also generates an indicator at330. The indicator may indicate that the second data word stored in thememory device 310 is a transformed version of the first data word. Theindicator may be generated based on generating the second data word. Insome cases, the indicator may indicate how each symbol type of the firstdata word is modified as part of the transformation used to generate thesecond data word stored in the memory device. For example, in the caseof the first and second data word each including three or more symboltypes, the indicator may indicate a mapping of symbol types used togenerate the second data word. In some instances, the indicator mayallow the memory device to properly read the data stored within thesecond data word (e.g., reverse the transformation as part of a readoperation). In the case that the memory device 310 generates a seconddata word, at 335, the memory device 310 may store the second data wordand the corresponding indicator based on determining that the seconddata word satisfies the second storage state criterion. In some cases,the indicator may be stored in a first portion of the memory device thatis different than a second portion of the memory device 310 that storesthe second data word.

The host device 305 may initiate a read operation at the memory device310. The read operation may occur independently of the write operationoccurring at 315, 320, 325, 330, 335, and 340. The read operation maybegin with the host device 305 transmitting a read command 340 to thememory device 310. In some cases, read command 340 may be associatedwith a location of the memory device 310. The memory device 310 maydetermine a data word associated with the location indicated by readcommand 340.

At 345, the memory device 310 may identify that the data word stored atthe location is associated with a second data word. That is, the memorydevice 310 may identify that the stored data word is a first data wordthat is a transformed version of a second data word. In some cases, thememory device 310 identifies that the first data word is associated withthe second data word by identifying an indicator stored in the memorydevice 310, which indicates that the first data word may be atransformed version of the second data word.

At 350, the memory device 310 may optionally transform the stored dataword. In some cases, the memory device 310 may transform the symbols ofthe first data word to generate the second data word based onidentifying that first data word is associated with the second dataword. That is, the memory device 310 may modify each symbol of the firstdata word to generate the second data word. In some cases, the first andsecond data words may each include three or more symbol types. In thesecases, each of the three or more symbol types of the first data word maybe mapped to a different symbol type of the second data word. In somecases, the memory device 310 may apply the transformation based on theindicator. That is, the memory device 310 may apply the transformationaccording to a transformation indicated by the indicator. In thisexample, the indicator may inform the memory device 310 how each symbolof the second data word was modified as part of a transformation used togenerate the first data word (and consequently an inverse transformationto generate the second data word from the first data word). However, inother cases, the memory device 310 may optionally not transform thestored data word. In these cases, the memory device 310 may identifythat the first data word may not be a transformed version of a seconddata word. For example, the memory device 310 may identify that theindicator stored in the memory device 310 indicates that the first dataword is not a transformed version of a second data word. Alternatively,the memory device 310 may identify whether or not the first data wordmay be a transformed version of the second data word.

At 355, the memory device 310 may transmit a data word to the hostdevice 305. In some cases, if the memory device 310 transformed thestored data word, the memory device 310 may transmit the second dataword to the host device 305. In some other cases, the memory device 310may not have identified that the first data word may be a transformedversion of a second data word. In this case, the memory device 310 maytransmit the stored first data word. In this case, the host device 305may determine that the first data word may be a transformed version ofthe second data word and transform the first data word to generate thesecond data word. In other cases, the memory device 310 may transmit thestored data word based on determining that the first data word may notbe a transformed version of a second data word.

FIG. 4 illustrates examples of data transformations 400 that supportdata storage based on data polarity in accordance with disclosed herein.In some examples, the data transformations 400 may implement aspects ofthe system 100, the memory die 200, as well as process flow 300. Datatransformations 400 may depict a transformation 410 of first data word405 into second data word 415. Data transformations 400 may furtherdepict a corresponding indicator 420, which may be an example of anindicator as described with reference to FIG. 3. FIG. 4 also illustratesthe five possible second data words 415 that may result fromtransformation 410 of first data word 405. Additionally, datatransformations 400 may include several possible configurations 425 ofindicator 420.

In the examples illustrated by FIG. 4, the first data word 405 mayinclude eight bits, where each discrete unit of the first data word 405may be represented by more than two unique symbol types. For example, adiscrete unit of the first data word 405 may be a low (L) value, amedium (M) value, or a high (H) value. In other cases, however, thefirst data word 405 may include any number of bits (e.g., one, two,three, four, five, six, seven, eight, or more). In some cases, eachdiscrete unit may be represented any number of unique symbol types(e.g., four symbol types, five symbol types, or more). As such, thepresent disclosure is not limited to data words that store a particularvalue set.

A memory device may be instructed to store the information contained infirst data word 405. However, the memory device may have specificstorage state criterion indicating a characteristic of the memory cellswithin the memory device. For example, a first storage state criterionmay correspond to a first characteristic indicating a type of symbol(s)(e.g., the information stored within each bit) that exhibits poorerperformance when stored and/or read by the memory device compared toother types of symbol(s). The performance of a symbol type may berelated to data retention (i.e., certain symbol types may exhibit worsedata retention characteristics than others due to, for example,leakage), power consumption (i.e., the memory device may consume morepower storing and/or reading one or more types of symbol versus anothertype of symbol), etc. Additionally or alternatively, a second storagestate criterion may correspond to a second characteristic of the memorydevice that indicates a type of symbol(s) that exhibits increasedoverall performance when stored and/or read by the memory device. Forexample, the second characteristic may indicate a symbol type that isassociated with better data retention or less power consumption.

The memory device may use the storage state criterion to determinewhether the data word should be transformed before it is stored in thememory cells of the memory device. Such a determination may be based onthe data word satisfying a storage state threshold that is associatedwith the first and/or second characteristic of the memory device. Forexample, a first storage state criterion may indicate a storage statethreshold that if met, the memory device determines to transform firstdata word 405 prior to storing the information contained within firstdata word 405. Additionally or alternatively, there may be a secondstorage state criterion.

In some cases, the second storage state criterion may indicate a minimumnumber of symbols of a given symbol type within a data word to be storedthat are indicated by the second characteristic as exhibiting increasedoverall performance compared to other symbol types. For example, amemory device may have a first characteristic indicating that ‘IVY bitsexhibit poorer overall performance and a second characteristicindicating that 1’ bits exhibit increased overall performance. In thisexample, the first storage state criterion may indicate that a data wordto be stored (e.g., first data word 405) may be transformed if itcontains five or more ‘IVY bits while the second storage state criterionmay indicate that the data word to be stored must contain three or more1’ bits. In other cases, the second storage state criterion may be theopposite of the first storage state criterion. In this case, the memorydevice may use a single storage state threshold. That is, if a data wordto be stored satisfies the threshold, the data word may be transformed.Alternatively, if the data word to be stored does not satisfy thethreshold, the data word may be stored by the memory device. Forexample, in a memory device where the first storage state criterionindicates that a data word to be stored may be transformed if itcontains five or more ‘M’ bits, the second storage state criterion mayindicate that a data word may be stored if it contains less than five‘M’ bits.

If first data word 405 satisfies the first storage state criterion ofthe memory device, the memory device may determine a transformation 410to generate a second data word 415 that satisfies the second storagestate criterion. Five possible transformations of first data word 405may be illustrated by the second data words 415-a, 415-b, 415-c, 415-d,and 415-e. Each of the second data words 415 may be generated by mappingeach symbol type of first data word 405 to a different symbol type togenerate second data word 415. In the example above where the first andsecond storage state criterions indicate independent storage statethresholds, the memory device may determine that first data word 405satisfies the first storage state criterion as first data word 405contains 5 ‘M’ bits, which aligns with the storage state threshold ofcontaining five or more ‘M’ bits. Therefore, the memory device maydetermine a transformation 410 which generates second data word 415,where second data word 415 satisfies the second storage state criterionof containing three or more ‘L’ bits. In this example, memory device mayutilize a transformation 410 that generates second data word 415-b.Therefore, second data word 415-b may then have one ‘M’ bit and havefive ‘L’ bits. The second data word 415-b may be generated by mappingeach ‘L’ bit of first data word 405 to an ‘M’ bit for second data word415-b, each ‘M’ bit of first data word 405 to an ‘L’ bit for second dataword 415-b, and each ‘H’ bit of first data word 405 to an ‘H’ bit forsecond data word 415-b.

However, in the example above where the first and second storage statecriterions each indicate the same storage state threshold, the memorydevice may determine that first data word 405 satisfies the firststorage state criterion as first data word 405 contains 5 ‘M’ bits,which aligns with the storage state threshold of containing five or more‘M’ bits. Therefore, the memory device may determine a transformation410 which generates second data word 415, where the second data word 415satisfies the second storage state criterion of containing less thanfive ‘M’ bits. In this example, memory device may utilize atransformation 410 that generates second data words 415-a, 415-b, 415-c,or 415-d. In each of second data words 415-a, 415-b, 415-c, and 415-d,there are one or two ‘M’ bits, which satisfies the second storage statecriterion of less than five ‘M’ bits.

During the transformation 410, the memory device may generate anindicator 420 corresponding to the transformation 410 of first data word405. Indicator 420 may indicate which transformation or mapping schemeused to generate second data word 415. For example, the memory devicemay generate indicator I₂ 420-b in the case that the memory device usedthe transformation 410 the generate second data word 415-b. The memorydevice may utilize one of configurations 425 for indicator 420. In someexamples, indicator 420 may be configured according to configuration425-a in which indicator 420 may be a single bit. In this example,indicator 420 may act to signal to the memory device that the seconddata word 415 may be a transformed version of the first data word 405.In such cases, the memory device may apply a preconfiguredtransformation 410 to the first data word 405. In some cases, the memorydevice may determine, based on knowing that the second data word 415 maybe a transformed version of a first data word 405, the transformation410 that was used to generate the second data word 415.

In another example, indicator 420 may be configured according toconfiguration 425-b in which indicator 420 may be two or more bits. Inthis example, the additional bits may allow the indicator 420 toindicate the transformation 410 utilized to generate second data word415. For example, when a discrete unit of a data word may be representedby three or more symbol types, bits B1 and B2 of the configuration 425-bof the indicator 420 may indicate the mapping scheme of thetransformation 410 used to generate second data word 415-b from firstdata word 405. For example, in a three symbol type data word, when theconfiguration 425-b is ‘00’ that may indicate no transformation, a ‘01’may indicate a first type of transformation, and a ‘10’ or ‘11’ mayindicate a second type of transformation.

In another example, indicator 420 may be configured according toconfiguration 425-c in which indicator 420 may be a single symbol thatmay be one of three or more possible symbol types. The indicator 420configured according to the configuration 425-c may be a multi-leveldata unit (e.g., a discrete unit that may be include three or moredifferent symbol types. In this example, the indicator 420 may indicatethat second data word 415 may be a transformed version of first dataword 405 and may indicate additional information relating to how eachsymbol of first data word 405 was modified to generate second data word415. For example, in a three symbol type data word, when theconfiguration 425-c is an ‘L’ level that may indicate no transformation,a ‘M’ level may indicate a first type of transformation, and a ‘H’ levelmay indicate a second type of transformation.

FIG. 5 illustrates an example of a process flow 500 that supports datastorage based on data polarity in accordance with disclosed herein. Insome examples, process flow 500 may implement aspects of the system 100and the memory die 200. The process flow 500 may include operationsperformed by a host device 505 and a memory device 510. The host device505 may be an example of host device described with reference to FIG. 1and the memory device 510 may be an example of memory device 110described with reference to FIG. 1. The process flow 500 illustrateswrite and read operations which may include transforming data based ondata polarity as implemented by the host device 505. The process flow500 may incorporate portions of the functions of the process flow 300described with reference to FIG. 3.

The host device 505 may initiate a write operation at the memory device510. The write operation may optionally include the host device 505transmitting a storage state criterion request to the memory device 510at 515. The storage state criterion may indicate a characteristic of thememory cells of the memory device 510 pertaining to the performance ofthe memory device 510 when storing different symbol types (e.g., leakagerates associated with the storage states corresponding to differentsymbol types). In some cases, the memory device 510 may have a firststorage state criterion indicating a symbol type that may be associatedwith poorer overall performance. In some examples, the symbol typeindicated by the first storage state criterion may be associated withmore leakage when stored in the memory device 510 compared to one ormore other symbol types. In other examples, the symbol type indicated bythe first storage state criterion may be associated with more powerconsumption when stored in the memory device 510 compared to one or moreother symbol types. Additionally or alternatively, the memory device 510may also have a second storage state criterion. The second storage statecriterion may indicate a symbol type or types that are associated withincreased overall performance when compared to the symbol typecorresponding to the first storage state criterion.

Each storage state criterion may indicate a storage state thresholdrelating to a quantity of the symbol type that may be indicated by thestorage state criterion. For example, the first storage state criterionmay indicate a first storage state threshold indicating a maximum numberof symbols of the symbol type associated with the first storage statecriterion. In some cases, the second storage state criterion mayindicate a second storage state threshold indicating a minimum number ofsymbols of the symbol type associated with the second storage statecriterion. In other cases, the second storage state criterion may dependon the first storage state threshold. For example, while the firststorage state criterion may relate to a data word that exceeds the firststorage state threshold, the second storage state criterion may relateto a data word that does not meet the first storage state threshold.

At 520, the memory device 510 may transmit the first storage statecriterion and/or the second storage state criterion to the host device505. In some cases, the host device 505 may transmit the storage statecriterion request based on receiving the storage state criterion requestfrom the host device 505. In other cases, the memory device 510 maytransmit the storage state criterion to the host device 505 withoutreceiving the storage state criterion request, such as during aninitialization phase of the memory device 510. The storage statecriterion may indicate the storage state criterion associated with thememory cells of the memory device 510. In some cases, the host device505 may transmit a storage state criterion request and receive thecriterion from the memory device 510 prior to every write operation. Inother cases, the host device 505 may store information associated withthe storage state criterion of the memory device 510.

The host device 505 may determine the first storage state criterionand/or the second storage state criterion of the memory device 510without the handshake procedure at 515 and 520. For example, the storagestate criterion (and the corresponding characteristic) may be anintrinsic property of the memory device 510. In this example, the hostdevice 505 may determine the storage state criterion based on a modelnumber, manufacturer, etc. In such examples, the host device 505 may usethe identifying information of the memory device 510 to look-up thestorage state criterion using information stored in other memory orcache associated with the host device 505. In other examples, thestorage state criteria may vary according to situation. For example, theperformance of the memory device 510 when storing and/or reading asymbol type may differ according to process, previous data stored by thememory device 510, temperature, etc. In this example, the host device505 may adjust the storage state criterion according to some predictedperformance of the memory device 510.

In some cases, the host device 505 may determine the first storage statecriterion and/or the second storage state criterion of the memory device510 through a training procedure. The training procedure may include thehost device 505 sending known data words to the memory device 510 aspart of a write operation. The memory device 510 may transmit errordetection signals to the host device 505. The host device 505 mayanalyze the power consumption associated with each of the writeoperations and/or error detection signals received from the memorydevice 510. The host device 505 may then determine characteristics ofthe memory device 510 when storing different symbol types. For example,the host device may identify a symbol type that may be associated withhigher data leakage when compared to one or more other symbol types. Inanother example, the host device 505 may identify a symbol type that maybe associated with higher power consumption during a write operationwhen compared to one or more other symbol types. The host device 505 maydetermine the first storage state criterion based on determining asymbol type associated with characteristics such as higher data leakageand/or power consumption. For example, the host device 505 may transmita first set of data words including ‘H’ symbol types, a second set ofdata words including ‘M’ symbol types, and a third set of data wordsincluding ‘L’ symbol types. The host device 505 may determine which setof data words (and corresponding symbol type) may be associated with ahigher error rate (i.e., based on receiving error detection signals fromthe memory device 510) when compared to the other sets of data words.The host device 505 may determine a first and/or second storage statecriterion based on the characteristics of the memory device 510 whenstoring each of the symbol types.

At 525, the host device 505 may identify information to be stored in thememory device 510 and may generate the first data word based on thatidentified information. The host device 505 may identify that the firstdata word satisfies the first storage state criterion. That is, the hostdevice 505 may determine that the first data word satisfies the storagestate threshold indicated by the first storage state criterion.

At 530, the host device 505 may generate a second data word thatsatisfies a second storage state criterion. The host device 505 maygenerate the second data word by applying a transformation to the firstdata word based on determining that the first data word satisfies thefirst storage state criterion. In some cases, the host device 505 maymodify each symbol of the first data word to generate the second dataword. In some cases, each data word may include two symbol types and thetransformation may be an example of a data bit inversion (i.e., each ‘0’value becomes a ‘1’ and vice versa). In other cases, the first data wordmay include three or more symbol types. In these examples, each symboltype of the first data word may be mapped to a different symbol type forthe second data word.

At 535, the host device 505 may send the second data word to the memorydevice 510. At 540, the memory device 510 may store the second data wordreceived at 535 from the host device 505.

In some cases, the host device 505 may initiate a read operation at thememory device 510. The read operation may occur independently of thewrite operation occurring at 515, 520, 525, 530, 535, and 540. The readoperation may begin with the host device 505 transmitting a read command545 to the memory device 510. In some cases, the read command 545 may beassociated with a location of the memory device 510. The memory device510 may determine a stored data word associated with the locationindicated by the read command 545. In some cases, the stored data wordmay be a first data word that may be a transformed version of a seconddata word. In this example, the read command may optionally include atransformation indicator commanding the memory device 510 to transformthe first data word into the second data word.

At 550, the memory device 510 may optionally transform the stored dataword to generate the second data word. In some cases, the memory device510 may transform the stored data word if the memory device 510 receivesa transformation indicator from the host device 505 at 545 within theread command.

At 555, the memory device 510 may transmit a data word to the hostdevice 505. In the case that the read command 545 included atransformation indicator, the data word transmitted at 555 may be thesecond data word. In the case that the read command 545 did not includea transformation indicator, the data word transmitted at 555 may be thestored data word. In this case, at 560, the host device 505 maytransform the stored data word received at 555 to generate the seconddata word.

FIG. 6 illustrates an example of a block diagram of memory array 600that supports data storage based on data polarity in accordance withdisclosed herein. In some examples, block diagram of memory array 600may implement aspects of the system 100 and the memory die 200. Forexample, memory array 600 may be an example of aspects of memory arrays170. Further, memory array 600 may be configured to perform theprocesses described with reference to FIGS. 3 and 5 as well as theexample data transformations described with reference to FIG. 4.

Memory array 600 may include partitions 605, 610, and 615 which maystore data words, indicators, and error correction codes (ECCs)respectively. Each partition may include one or more memory cells ofmemory array 600.

Partition 605 may store one or more data words, which may be examples ofthe first and second data words as described with reference to FIGS. 3,4, and 5. In some cases, partition 605 may store data words that are nottransformed versions of a different data word. However, in other cases,partition 605 may store data words that are transformed versions ofdifferent data words. In some instances, each data word stored inpartition 605 may satisfy a second storage state criterion indicating acharacteristic of memory array 600 which causes a certain symbol type ortypes to exhibit less detrimental behavior when read or stored than adifferent symbol type. That is, each data word stored within partition605 may comprise at least a certain number of symbols (i.e., a quantityof symbols that is indicated by a storage state threshold) that are asymbol type that may exhibit less detrimental behavior than othersymbols. Thus, partition 605 may store data words to reduce theoccurrence of certain symbols associated with more detrimental behavior(e.g., poor data retention or higher power consumption).

Partition 610 may store indicators as described with reference to FIGS.3 and 4. Each stored indicator may correspond to a stored data word. Theindicators may indicate that a data word associated with the indicatormay be a transformed version of a different data word. The stored dataword may have been transformed prior to being stored based on thestorage state criterion indicating a data retention characteristic orpower consumption characteristic of the memory cells of memory array600. The indicators may further indicate how each symbol type of eachstored data word may have been modified as part of the transformationused to generate the first data word stored in partition 605 of memoryarray 600. Memory array 600 may be configured to transform the storeddata word into the different data word indicated by the indicators.

Memory array 600 may further comprise a third partition 615 for storingECC information associated with each data word stored in partition 605.The ECC may allow memory array 600 to detect errors within a data wordor words during a read operation. In this example, memory array 600 maystore both an ECC and an indicator for each data word stored by memoryarray 600. For example, a data word that is to be stored which does notcontain any symbols of the type that are associated with moredetrimental behavior may be stored without being transformed. In thisexample, memory array 600 may store the original data word in partition605, an indicator indicating that the stored data word may not be atransformed version of another data word in partition 610, and an ECCrelating to the data word in partition 615. In another example, the dataword that is to be stored may contain a quantity of symbols of the typethat are more detrimental than other symbol types. In this example,memory array 600 may transform the original data word to generate asecond data word. In this example, memory array 600 may store the seconddata word in partition 605, an indicator indicating that the stored dataword may be a transformed version of another data word in partition 610,and an ECC relating to the second data word in partition 615.

In some cases, each of partitions 605, 610, and 615 may benon-overlapping portions of memory within memory array 600. In othercases, partitions 605, 610, and 615 may overlap partially or completely.For example, partition 610 storing indicators may utilize overlappingmemory cells of memory array 600 as partition 615 for storing ECCs.

FIG. 7 illustrates an example of a block diagram 700 of a memory device705 that supports data storage based on data polarity in accordance withdisclosed herein. The memory device may be an example of aspects of thememory device 110, 310, 510, and memory die 200. The memory device 705may include receiving component 710, storage state criterion manager715, data word transformer 720, storing component 725, indicatorcomponent 730, data retention characteristic manager 735, andtransmitting component 740. Each of these components may communicate,directly or indirectly, with one another (e.g., via one or more buses)and may be implemented by a device memory controller or a local memorycontroller.

In some cases, such as during a write or program operation, receivingcomponent 710 may receive, from a host device, a first data word to bestored in memory device 705. In some cases, receiving component 710 mayreceive a third data word from the host device to be stored in memorydevice 705. In some instances, such as during a read operation,receiving component 710 may receive, from a host device, a read commandassociated with a location of memory device 705.

Storage state criterion manager 715 may determine that the first dataword satisfies a first storage state criterion of the memory device, thefirst storage state criterion indicating a first data retentioncharacteristic of one or more memory cells of memory device 705. Inother cases, storage state criterion manager 715 may determine that asecond data word satisfies a second storage state criterion based ondetermining that the quantity of symbols of the second data word thatare the symbol type associated with the second data retentioncharacteristic satisfies the storage state threshold of memory device705, where storing the second data word in memory device 705 may bebased on determining that the second data word satisfies the secondstorage state criterion. In some instances, storage state criterionmanager 715 may determine that the third data word satisfies the secondstorage state criterion of memory device 705.

Data word transformer 720 may generate a second data word that satisfiesa second storage state criterion by applying a transformation to thefirst data word based on determining that the first data word satisfiesthe first storage state criterion, the second storage state criterionindicating a second data retention characteristic of the one or morememory cells of memory device 705. In some cases, data word transformer720 may generate the second data word by modifying each symbol of thefirst data word to generate the second data word, the first data wordand the second data word each including three or more symbol types,where each symbol type of the first data word may be mapped to adifferent symbol type of the second data word.

Data word transformer 720 may apply a transformation to symbols of thefirst data word stored in memory device 705 to generate the second dataword based on identifying that the first data word stored in memorydevice 705 may be associated with the second data word. In some cases,data word transformer 720 may modify each symbol of the first data wordto generate the second data word, the first data word and the seconddata word each including three or more symbol types, where each symboltype of the first data word may be mapped to a different symbol type ofthe second data word.

Storing component 725 may store the second data word in memory device705. In some cases, storing component 725 may store an indicator inmemory device 705. In some examples, the indicator may be stored in afirst portion of memory device 705 that may be different than a secondportion of memory device 705 that stores the second data word. In someinstances, storing component 725 may store the third data word in memorydevice 705. In some cases, such as during a read operation, storingcomponent 725 may identify that a first data word stored at the locationindicated by a read command may be associated with a second data word.

Indicator component 730 may generate an indicator that the second dataword stored in memory device 705 may be a transformed version of thefirst data word based on generating the second data word. In some cases,the indicator may indicate how each symbol type of the first data wordmay be modified as part of the transformation used to generate thesecond data word stored in memory device 705. In some cases, such asduring a read operation, indicator component 730 may identify anindicator stored in memory device 705 that indicates that the first dataword may be a transformed version of the second data word, whereapplying the transformation may be based on the indicator. In someinstances, the indicator may indicate how each symbol type of the firstdata word may be modified as part of the transformation used to generatethe first data word, where applying the transformation may be based onthe transformation indicated in the indicator.

Data retention characteristic manager 735 may determine a quantity ofsymbols of the first data word that are a symbol type associated withthe second data retention characteristic of the one or more memory cellsof memory device 705. In some cases, data retention characteristicmanager 735 may determine that the quantity of symbols of the first dataword that are the symbol type associated with the second data retentioncharacteristic fails to satisfy a storage state threshold of memorydevice 705. In some examples, data retention characteristic manager 735may determine a quantity of symbols of the second data word that are asymbol type associated with the second data retention characteristic ofmemory device 705 for storing in the one or more memory cells. In someinstances, data retention characteristic manager 735 may determine thatthe quantity of symbols of the second data word that are the symbol typeassociated with the second data retention characteristic satisfies astorage state threshold of memory device 705. In some examples, thesecond data retention characteristic may indicate a symbol type that maybe configured to be stored in memory device 705 that exhibits lessleakage compared to one or more symbol types configured to be stored inmemory device 705 that are indicated by the first data retentioncharacteristic.

Transmitting component 740 may, during a read operation for example,transmit a second data word to the host device.

An apparatus for data storage based on data polarity is described. Theapparatus may include means for receiving, from a host device, a firstdata word to be stored in a memory device, determining, by the memorydevice, that the first data word may satisfy a first storage statecriterion of the memory device. In some cases, the first storage statecriterion may indicate a first data retention characteristic of one ormore memory cells of the memory device. The apparatus may include meansfor generating a second data word that satisfies a second storage statecriterion by applying a transformation to the first data word based ondetermining that the first data word satisfies the first storage statecriterion. In some examples, the second storage state criterion mayindicate a second data retention characteristic of the one or morememory cells of the memory device. In some cases, the apparatus mayinclude means for storing the second data word in the memory device.

Some examples of the method and apparatus described herein may furtherinclude operations or means for generating an indicator that the seconddata word stored in the memory device may be a transformed version ofthe first data word based on generating the second data word and storingthe indicator in the memory device.

In some examples of the method and apparatus described herein, theindicator may indicate how each symbol type of the first data word maybe modified as part of the transformation used to generate the seconddata word stored in the memory device.

In some examples of the method and apparatus described herein, theindicator may be stored in a first portion of the memory device that maybe different than a second portion of the memory device that stores thesecond data word.

Some examples of the method and apparatus described herein may furtherinclude operations or means for modifying each symbol of the first dataword to generate the second data word. In some cases, the first dataword and the second data word may each include three or more symboltypes, where each symbol type of the first data word may be mapped to adifferent symbol type of the second data word.

Some examples of the method and apparatus described herein may furtherinclude operations or means for determining a quantity of symbols of thefirst data word that may be a symbol type associated with the seconddata retention characteristic of the one or more memory cells of thememory device. Some examples of the method and apparatus describedherein may further include operations or means for determining that thequantity of symbols of the first data word that may be the symbol typeassociated with the second data retention characteristic may fail tosatisfy a storage state threshold of the memory device.

Some examples of the method and apparatus described herein may furtherinclude operations or means for determining a quantity of symbols of thesecond data word that may be a symbol type associated with the seconddata retention characteristic of the memory device for storing in theone or more memory cells and determining that the quantity of symbols ofthe second data word that may be the symbol type associated with thesecond data retention characteristic may satisfy a storage statethreshold of the memory device. In some cases, the method and apparatusdescribed herein may further include operations or means for determiningthat the second data word may satisfy the second storage state criterionbased on determining that the quantity of symbols of the second dataword that may be the symbol type associated with the second dataretention characteristic may satisfy the storage state threshold of thememory device. In some examples, storing the second data word in thememory device may be based on determining that the second data wordsatisfies the second storage state criterion.

In some examples of the method and apparatus described herein, thesecond data retention characteristic indicates a symbol type that may beconfigured to be stored in the memory device that exhibits less leakagecompared to one or more symbol types configured to be stored in thememory device that may be indicated by the first data retentioncharacteristic.

Some examples of the method and apparatus described herein may furtherinclude operations or means for receiving a third data word from thehost device to be stored in the memory device, determining, by thememory device, that the third data word satisfies the second storagestate criterion of the memory device, and storing the third data word inthe memory device.

An apparatus for data storage based on data polarity is described. Theapparatus may include means for receiving, from a host device, a readcommand associated with a location of a memory device, and identifying,by the memory device, that a first data word stored at the location maybe associated with a second data word. The apparatus may further includemeans for applying a transformation to symbols of the first data wordstored in the memory device to generate the second data word based onidentifying that the first data word stored in the memory device may beassociated with the second data word and sending the second data word tothe host device.

Some examples of the method and apparatus described herein may furtherinclude operations or means for identifying an indicator stored in thememory device that indicates that the first data word may be atransformed version of the second data word, where applying thetransformation may be based on the indicator.

In some examples of the method and apparatus described herein,identifying that the first data word stored in the memory device may beassociated with the second data word further may include operations,features, means, or instructions for identifying an indicator stored inthe memory device that indicates how each symbol type of the first dataword may be modified as part of the transformation used to generate thefirst data word, where applying the transformation may be based on thetransformation indicated in the indicator.

In some examples of the method and apparatus described herein, applyingthe transformation to the first data word stored in the memory device togenerate the second data word further may include operations, features,means, or instructions for modifying each symbol of the first data wordto generate the second data word, the first data word and the seconddata word each including three or more symbol types. In some cases, eachsymbol type of the first data word may be mapped to a different symboltype of the second data word.

An apparatus for data storage based on data polarity is described. Theapparatus may include means for identifying, by a host device, that afirst data word to be stored in a memory device may satisfy a firststorage state criterion of the memory device. In some examples, thefirst storage state criterion may indicate a first data retentioncharacteristic of one or more memory cells of the memory device. Theapparatus may include means for generating a second data word that maysatisfy a second storage state criterion by applying a transformation tothe first data word based on determining that the first data word maysatisfy the first storage state criterion. In some cases, a second dataretention characteristic may indicate a symbol type that may beconfigured to be stored in the one or more memory cells that exhibitsless leakage compared to one or more symbol types configured to bestored in the one or more memory cells that are indicated by the firstdata retention characteristic. The apparatus may further include meansfor sending the second data word to the memory device.

Some examples of the method and apparatus described herein may furtherinclude operations or means for receiving, from the memory device, amessage indicating the first storage state criterion associated with theone or more memory cells.

Some examples of the method and apparatus described herein may furtherinclude operations or means for sending, to the memory device, a requestfor the first storage state criterion of the one or more memory cells,where receiving the message may be based on sending the request.

In some examples of the method and apparatus described herein,generating the second data word by applying the transformation to thefirst data word further may include operations, features, means, orinstructions for modifying each symbol of the first data word togenerate the second data word, the first data word and the second dataword each including three or more symbol types, where each symbol typeof the first data word may be mapped to a different symbol type of thesecond data word.

Some examples of the method and apparatus described herein may furtherinclude operations or means for sending, to the memory device, a readcommand for a stored data word, the read command including atransformation indicator commanding the memory device to transform thestored data word and receiving, from the memory device, a transformeddata word.

Some examples of the method and apparatus described herein may furtherinclude operations or means for sending, to the memory device, a readcommand for the second data word, receiving, from the memory device, thesecond data word, and transforming the second data word to generate thefirst data word.

FIG. 8 shows a flowchart illustrating a method 800 that supports datastorage based on data polarity in accordance with disclosed herein. Theoperations of method 800 may be implemented by a memory device or itscomponents as described herein. For example, the operations of method800 may be performed by a memory device as described with reference toFIGS. 1 through 4, 6, and 7. In some examples, a memory device mayexecute a set of instructions to control the functional elements of thememory device to perform the functions described below. Additionally oralternatively, a memory device may perform aspects of the functionsdescribed below using special-purpose hardware.

At 805, the memory device may receive, from a host device, a first dataword to be stored in a memory device. The operations of 805 may beperformed according to the methods described herein. In some examples,aspects of the operations of 805 may be performed by a memory device asdescribed with reference to FIGS. 1 through 4, 6, and 7.

At 810, the memory device may determine that the first data wordsatisfies a first storage state criterion of the memory device, thefirst storage state criterion indicating a first data retentioncharacteristic of one or more memory cells of the memory device. Theoperations of 810 may be performed according to the methods describedherein. In some examples, aspects of the operations of 810 may beperformed by a memory device as described with reference to FIGS. 1through 4, 6, and 7.

At 815, the memory device may generate a second data word that satisfiesa second storage state criterion by applying a transformation to thefirst data word based on determining that the first data word satisfiesthe first storage state criterion, the second storage state criterionindicating a second data retention characteristic of the one or morememory cells of the memory device. The operations of 815 may beperformed according to the methods described herein. In some examples,aspects of the operations of 815 may be performed by a memory device asdescribed with reference to FIGS. 1 through 4, 6, and 7.

At 820, the memory device may store the second data word in the memorydevice. The operations of 820 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 820 maybe performed by a memory device as described with reference to FIGS. 1through 4, 6, and 7.

FIG. 9 shows a flowchart illustrating a method 900 that supports datastorage based on data polarity in accordance with disclosed herein. Theoperations of method 900 may be implemented by a memory device or itscomponents as described herein. For example, the operations of method900 may be performed by a memory device as described with reference toFIGS. 1 through 4, 6, and 7. In some examples, a memory device mayexecute a set of instructions to control the functional elements of thememory device to perform the functions described below. Additionally oralternatively, a memory device may perform aspects of the functionsdescribed below using special-purpose hardware.

At 905, the memory device may receive, from a host device, a first dataword to be stored in a memory device. The operations of 905 may beperformed according to the methods described herein. In some examples,aspects of the operations of 905 may be performed by a memory device asdescribed with reference to FIGS. 1 through 4, 6, and 7.

At 910, the memory device may determine, by the memory device, that thefirst data word satisfies a first storage state criterion of the memorydevice, the first storage state criterion indicating a first dataretention characteristic of one or more memory cells of the memorydevice. The operations of 910 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 910 maybe performed by a memory device as described with reference to FIGS. 1through 4, 6, and 7.

At 915, the memory device may modify each symbol of the first data wordto generate the second data word, the first data word and the seconddata word each including three or more symbol types, where each symboltype of the first data word may be mapped to a different symbol type ofthe second data word. The operations of 915 may be performed accordingto the methods described herein. In some examples, aspects of theoperations of 915 may be performed by a memory device as described withreference to FIGS. 1 through 4, 6, and 7.

At 920, the memory device may generate a second data word that satisfiesa second storage state criterion by applying a transformation to thefirst data word based on determining that the first data word satisfiesthe first storage state criterion, the second storage state criterionindicating a second data retention characteristic of the one or morememory cells of the memory device. The operations of 920 may beperformed according to the methods described herein. In some examples,aspects of the operations of 920 may be performed by a memory device asdescribed with reference to FIGS. 1 through 4, 6, and 7.

At 925, the memory device may generate an indicator that the second dataword stored in the memory device may be a transformed version of thefirst data word based on generating the second data word. The operationsof 925 may be performed according to the methods described herein. Insome examples, aspects of the operations of 925 may be performed by amemory device as described with reference to FIGS. 1 through 4, 6, and7.

At 930, the memory device may store the second data word in the memorydevice. The operations of 930 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 930 maybe performed by a memory device as described with reference to FIGS. 1through 4, 6, and 7.

At 935, the memory device may store the indicator in the memory device.The operations of 935 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 935 maybe performed by a memory device as described with reference to FIGS. 1through 4, 6, and 7.

FIG. 10 shows a flowchart illustrating a method 1000 that supports datastorage based on data polarity in accordance with disclosed herein. Theoperations of method 1000 may be implemented by a memory device or itscomponents as described herein. For example, the operations of method1000 may be performed by a memory device as described with reference toFIGS. 1 through 4, 6, and 7. In some examples, a memory device mayexecute a set of instructions to control the functional elements of thememory device to perform the functions described below. Additionally oralternatively, a memory device may perform aspects of the functionsdescribed below using special-purpose hardware.

At 1005, the memory device may receive, from a host device, a readcommand associated with a location of a memory device. The operations of1005 may be performed according to the methods described herein. In someexamples, aspects of the operations of 1005 may be performed by a memorydevice as described with reference to FIGS. 1 through 4, 6, and 7.

At 1010, the memory device may identify, by the memory device, that afirst data word stored at the location may be associated with a seconddata word. The operations of 1010 may be performed according to themethods described herein. In some examples, aspects of the operations of1010 may be performed by a memory device as described with reference toFIGS. 1 through 4, 6, and 7.

At 1015, the memory device may apply a transformation to symbols of thefirst data word stored in the memory device to generate the second dataword based on identifying that the first data word stored in the memorydevice may be associated with the second data word. The operations of1015 may be performed according to the methods described herein. In someexamples, aspects of the operations of 1015 may be performed by a memorydevice as described with reference to FIGS. 1 through 4, 6, and 7.

At 1020, the memory device may send the second data word to the hostdevice.

The operations of 1020 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1020may be performed by a memory device as described with reference to FIGS.1 through 4, 6, and 7.

FIG. 11 shows a flowchart illustrating a method 1100 that supports datastorage based on data polarity in accordance with disclosed herein. Theoperations of method 1100 may be implemented by a host device or itscomponents as described herein. For example, the operations of method1100 may be performed by a host device as described with reference toFIGS. 1, 2, and 5-7. In some examples, a host device may execute a setof instructions to control the functional elements of the host device toperform the functions described below. Additionally or alternatively, ahost device may perform aspects of the functions described below usingspecial-purpose hardware.

At 1105, the host device may identify, by a host device, that a firstdata word to be stored in a memory device satisfies a first storagestate criterion of the memory device, the first storage state criterionindicating a first data retention characteristic of one or more memorycells of the memory device. The operations of 1105 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1105 may be performed by a host device as describedwith reference to FIGS. 1, 2, and 5-7.

At 1110, the host device may generate a second data word that satisfiesa second storage state criterion by applying a transformation to thefirst data word based on determining that the first data word satisfiesthe first storage state criterion, a second data retentioncharacteristic indicating a symbol type that may be configured to bestored in the one or more memory cells that exhibits less leakagecompared to one or more symbol types configured to be stored in the oneor more memory cells that are indicated by the first data retentioncharacteristic. The operations of 1110 may be performed according to themethods described herein. In some examples, aspects of the operations of1110 may be performed by a host device as described with reference toFIGS. 1, 2, and 5-7.

At 1115, the host device may send the second data word to the memorydevice.

The operations of 1115 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1115may be performed by a host device as described with reference to FIGS.1, 2, and 5-7.

It should be noted that the methods described above describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

The terms “electronic communication,” “conductive contact,” “connected,”and “coupled” may refer to a relationship between components thatsupports the flow of signals between the components. Components areconsidered in electronic communication with (or in conductive contactwith or connected with or coupled with) one another if there is anyconductive path between the components that can, at any time, supportthe flow of signals between the components. At any given time, theconductive path between components that are in electronic communicationwith each other (or in conductive contact with or connected with orcoupled with) may be an open circuit or a closed circuit based on theoperation of the device that includes the connected components. Theconductive path between connected components may be a direct conductivepath between the components or the conductive path between connectedcomponents may be an indirect conductive path that may includeintermediate components, such as switches, transistors, or othercomponents. In some cases, the flow of signals between the connectedcomponents may be interrupted for a time, for example, using one or moreintermediate components such as switches or transistors.

The term “coupling” refers to condition of moving from an open-circuitrelationship between components in which signals are not presentlycapable of being communicated between the components over a conductivepath to a closed-circuit relationship between components in whichsignals are capable of being communicated between components over theconductive path. When a component, such as a controller, couples othercomponents together, the component initiates a change that allowssignals to flow between the other components over a conductive path thatpreviously did not permit signals to flow.

The term “isolated” refers to a relationship between components in whichsignals are not presently capable of flowing between the components.Components are isolated from each other if there is an open circuitbetween them. For example, two components separated by a switch that ispositioned between the components are isolated from each other when theswitch is open. When a controller isolates two components, thecontroller affects a change that prevents signals from flowing betweenthe components using a conductive path that previously permitted signalsto flow.

A switching component or a transistor discussed herein may represent afield-effect transistor (FET) and comprise a three terminal deviceincluding a source, drain, and gate. The terminals may be connected toother electronic elements through conductive materials, e.g., metals.The source and drain may be conductive and may comprise a heavily-doped,e.g., degenerate, semiconductor region. The source and drain may beseparated by a lightly-doped semiconductor region or channel. If thechannel is n-type (i.e., majority carriers are signals), then the FETmay be referred to as a n-type FET. If the channel is p-type (i.e.,majority carriers are holes), then the FET may be referred to as ap-type FET. The channel may be capped by an insulating gate oxide. Thechannel conductivity may be controlled by applying a voltage to thegate. For example, applying a positive voltage or negative voltage to ann-type FET or a p-type FET, respectively, may result in the channelbecoming conductive. A transistor may be “on” or “activated” when avoltage greater than or equal to the transistor's threshold voltage isapplied to the transistor gate. The transistor may be “off” or“deactivated” when a voltage less than the transistor's thresholdvoltage is applied to the transistor gate.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details toproviding an understanding of the described techniques. Thesetechniques, however, may be practiced without these specific details. Insome instances, well-known structures and devices are shown in blockdiagram form to avoid obscuring the concepts of the described examples.

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, or optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, an FPGA or other programmablelogic device, discrete gate or transistor logic, or discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed herein. A general-purpose processor may be a microprocessor,but in the alternative, the processor may be any processor, controller,microcontroller, or state machine. A processor may also be implementedas a combination of computing devices (e.g., a combination of a DSP anda microprocessor, multiple microprocessors, one or more microprocessorsin conjunction with a DSP core, or any other such configuration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, or firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations. Also, as used herein, including in the claims, “or” as usedin a list of items (for example, a list of items prefaced by a phrasesuch as “at least one of or” “one or more of”) indicates an inclusivelist such that, for example, a list of at least one of A, B, or C meansA or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, asused herein, the phrase “based on” shall not be construed as a referenceto a closed set of conditions. For example, an exemplary step that isdescribed as “based on condition A” may be based on both a condition Aand a condition B without departing from the scope of the presentdisclosure. In other words, as used herein, the phrase “based on” shallbe construed in the same manner as the phrase “based at least in parton.”

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be apparent to those skilled in the art, and the generic principlesdefined herein may be applied to other variations without departing fromthe scope of the disclosure. Thus, the disclosure is not limited to theexamples and designs described herein, but is to be accorded thebroadest scope consistent with the principles and novel featuresdisclosed herein.

1. (canceled)
 2. A memory device, comprising: a memory array; a receiving component configured to receive, from a host device, a storage state criterion request; a transmitting component configured to transmit, responsive to the storage state criterion request, a plurality of storage state criterions associated with the memory device; the receiving component configured to receive, from the host device, a data word that has satisfied a first storage state criterion and a second storage state criterion of the plurality of storage state criterions; and a storing component configured to store the data word in the memory device.
 3. The memory device of claim 2, wherein: the receiving component is further configured to the receive, from the host device, a read command associated with a location of the data word; and the transmitting component is further configured to transmit the data word based at least in part on the read command being exclusive of a transformation indicator.
 4. The memory device of claim 2, wherein the first storage state criterion indicates a first storage state threshold indicating a maximum number of symbols of a symbol type associated with the first storage state criterion.
 5. The memory device of claim 2, wherein the second storage state criterion indicates a second storage state threshold indicating a minimum number of symbols of a symbol type associated with the second storage state criterion.
 6. The memory device of claim 2, wherein the data word is a transformation of information to be stored in the memory device, the transformation based at least in part on the information satisfying the first storage state criterion.
 7. The memory device of claim 6, wherein each symbol of the data word is modified from each symbol of the information.
 8. The memory device of claim 6, wherein the transformation comprises a data bit inversion.
 9. An apparatus, comprising: a memory array; a controller coupled with the memory array and configured to cause the apparatus to: transmit, to a memory device, a command associated with an access operation; receive, from the memory device, a data word that has satisfied a first storage state criterion and a second storage state criterion, the first storage state criterion different from the second storage state criterion; and transform the data word based at least in part on the command.
 10. The apparatus of claim 9, wherein the controller is further configured to cause the apparatus to: transmit the command exclusive of a transformation indicator.
 11. The apparatus of claim 10, wherein the controller is further configured to cause the apparatus to: determine that the command was transmitted exclusive of the transformation indicator, wherein the data word is transformed based at least in part on the determination.
 12. The apparatus of claim 9, wherein the first storage state criterion is associated with a symbol type of a memory cell associated with higher data leakage or increased power consumption compared to one or more other symbol types.
 13. An apparatus, comprising: a memory array; and a controller coupled with the memory array and configured to cause the apparatus to: apply a transformation to a first data word to develop a second data word based at least in part on the first data word satisfying a first storage state criterion; generate an indicator associated with the second data word, the indicator signaling that the second data word is a transformed version of the first data word; and store the second data word and the indicator in the memory array.
 14. The apparatus of claim 13, wherein the controller is further configured to cause the apparatus to: determine that the first data word fails to satisfy a second storage state criterion, wherein the transformation is applied based at least in part on the determination.
 15. The apparatus of claim 13, wherein the controller is further configured to cause the apparatus to: determine that the second data word satisfies a second storage state criterion after the transformation, wherein storing the second data word is based at least in part on the determination.
 16. The apparatus of claim 13, wherein the indicator signals how each symbol type of the first data word is modified as a part of the transformation.
 17. The apparatus of claim 16, wherein the first data word and the second data word each comprise of three or more symbol types.
 18. The apparatus of claim 16, wherein each symbol type of the first data word is mapped to a different symbol type of the second data word.
 19. The apparatus of claim 13, wherein the indicator signals a type of transformation that has been applied.
 20. The apparatus of claim 13, wherein the second data word is stored in a first portion of the memory array and the indicator is stored in a second portion of the memory array, the first portion of the memory array different than the second portion of the memory array.
 21. The apparatus of claim 13, wherein the controller is further configured to cause the apparatus to: receive, from a host device, a read command associated with a location of the second data word; determining that the second data word has been transformed based at least in part on the indicator; and transmitting the second data word based at least in part on the determination. 